Trough drain



FIG. 1 perspective view of a trough drain showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof the right side elevational view is identical thereto;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a left end elevational view thereof the right end elevational view being identical thereto. 

The ornamental design for a trough drain, as shown and described. 